Me pēhea te hanga i te konganuku konutea mō ngā mīhini ahumahi
He konganuku kore-ferrous te konutea e whakamahia whānuitia ana i roto i te ahumahi nā te mea he ngāwari ki te pokepoke, he ātete pai ki te waikura, ā, he iti te utu. I roto i ngā mahi mīhini ahumahi, kāore i te tino whakamahia te konutea hei konganuku parakore; he nui ake te whakamahi i ngā koranu konutea nā te mea ka taea te whakapai ake i ō rātou āhuatanga miihini—hei tauira, te kaha kume, te pakeke, te ātete ki te kakahu, me te pumau o ngā āhuatanga. E matapakihia ana e tēnei tuhinga te tukanga hanga koranu konutea mō ngā wāhanga mīhini ahumahi, mai i te kōwhiringa hanganga me te whakarite rauemi ki te rewa me te whakarewa, ki te whakahaere kounga.
1. Te Mārama ki te Hiahia mō ngā Wāhanga Mīhini Ahumahi
I mua i te hanga i tētahi koranu, me whakatau tuatahi te whakamahinga e hiahiatia ana. Ko ngā wāhanga mīhini ahumahi e whakamahi pinepine ana i ngā koranu konutea ko ngā whare taputapu iti, ngā taupoki, ngā whāriki, ngā pūwero māmā, ngā pūwero kore-whakahirahira, ngā wāhanga mīhini, me ngā wāhanga whakarewa-mate. He rerekē ngā whakaritenga mō ia wāhanga, hei tauira:
– Te kaha me te mārō hei tu atu i ngā kawenga, i te waku rānei
– Ātete ki te waikura mō ngā taiao makuku, mō te pānga rānei ki ngā matū ngawari
– Ngāwari o te tukanga (maka/maka mate) mō te hanga papatipu pumau
– Ātete ngokingoki (whakarerekētanga puhoi) i tētahi pāmahana mahi
He iti noa te ira rewa o te konutea (tata ki te 419°C), ā, he pai ake te penapena pūngao i te konumohe, i te maitai rānei. Heoi anō, he tairongo anō hoki ngā koranu konutea ki te hanganga me te poke, ā, he mea nui te whakahaere tukanga.
2. Te Kōwhiri i te Momo Tika o te Konutea Konutea
I roto i te ahumahi, ko ngā koranu konutea rongonui ko te whānau ZAMAK (Konutea-Aluminium-Magnesium-Kupfer/parahi) me ētahi koranu konutea-aluminium (ZA). Ko te whiriwhiri i te koranu e whakatau ana i ngā āhuatanga whakamutunga me te ngāwari o te hanga.
1. ZAMAK 3
He mea noa mō te whakarewa mate, he pumau, he ngāwari ki te tukatuka, he pai te āhua o te mata. He pai mō ngā wāhanga mīhini maha kāore e hiahia ki te kaha nui.
2. ZAMAK 5
He rite ki a ZAMAK 3 engari he nui ake te parahi, ā, he kaha ake, he ātete hoki ki te pakaru. He pai mō ngā wāhanga e hiahia ana kia kaha ake.
3. ZA-8, ZA-12, ZA-27 (Zinc-Aluminium)
Ko te tikanga he nui ake te kaha me te ātete ki te pakaru, engari ka nui ake te uaua o te tukanga i runga i te tikanga whakarewa.
Me whai whakaaro te kōwhiringa o ngā koranu ki ngā paerewa rauemi e tika ana mō te kamupene, me titiro rānei ki ngā paerewa ahumahi (hei tauira, ASTM/ISO) kia ōrite ai ngā whakatakotoranga.
3. Ngā Rauemi Mata: Te Whakahaere i te Parakore me te Parakore
Ko te angitu o te konutea koranu e whakawhirinaki ana ki te parakore o te konutea me te kounga o ngā huānga kua tāpirihia. Ngā mea hei whakaaroaro:
– Whakamahia ngā konganuku konutea kounga teitei (he tohu ahumahi tika) kia kore ai e hipa ngā ihirangi o te mata (Pb), te cadmium (Cd), me te tine (Sn) i ngā taumata e hiahiatia ana. Ka taea e ētahi poke te whakaiti i te pakari, te whakaoho i te pakaru, te whakatere rānei i te waikura intergranular.
– Ngā huānga whakarewa noa:
– Konumohe (Al): ka whakanui ake i te kaha, te pakeke, me te ngāwari ki te pokepoke
– Konupora (Mg): ka whakapai ake i te pumau me te āwhina ki te whakaiti i ētahi waikura
– Parahi (Cu): ka whakanui i te kaha me te ātete ki te kakahu, engari ki te nui rawa ka whakaiti i te ngāwari me te pā ki te pumau o ngā āhuatanga mō te wā roa.
I roto i ngā mahi wheketere, ko te tikanga ka whakahaeretia te hanganga mā te ine me te tāpiri i te koranu matua kia pai ake ai te tika.
4. Te Whakarite i ngā Taputapu Whakarewa
Ka hangaia ngā koranu konutea i roto i te oumu ka taea te whakahaere i te pāmahana pumau. Ko ngā whakaritenga matua ko:
– He oko para (kowi) he oumu rānei e tika ana mō te konutea rewa (me hototahi ngā rauemi hei ārai i te poke).
– He taputapu ine pāmahana tika (thermocouple).
– Taupokina/rere te hau mēnā e tika ana hei whakaiti i te waikura o te mata.
– He mīhini whakaoho ātete-wera hei whakaōrite.
Nā te iti o te ira rewa, ka ngāwari te rewa o te konutea, engari ka tere hoki te hanga waikura ki runga i te mata. Ka taea te kawe atu i ngā waikura nui rawa i te wā e ringihia ana, ā, ka puta he pōrohe, he hapa whakaurunga rānei.
5. Te Tukanga Rewa me te Whakaranu (Whakakotahitanga)
Ngā wāhanga whānui o te hanga konutea:
1. Rewahia te turanga konutea
Whakamahanahia te konutea kia rewa rawa, kia noho hoki ki roto i te awhe pāmahana mahi e tika ana (kia nui hei pupuri i te pumau o te wai, engari kaua e nui rawa hei ārai i te pikinga o te waikura).
2. Te tāpiri i ngā huānga whakarewa
Ka tāpirihia te konumohe, te konupora, me te parahi kia rite ki te hanganga e hiahiatia ana. I te nuinga o te wā ka tāpirihia mārire kia tere ai te memeha me te ngāwari o te whakahaere. Me whakaoho i tēnei wā kia ōrite ai te tohatoha.
3. Whakahaerehia te waikura me te paru
Ko te paru (he ranunga o ngā waikura) ka puta i te mata o te wai. Me āta tangohia te paru kia kore ai e konatunatua ki te wai. Mena me rere te wai i roto i te tukanga, me whakamahi kia rite ki ngā tikanga a te kaihanga kia kore ai e puta he toenga ka whakararu i te kounga.
4. Te Whakaōrite
Kia rewa katoa ngā kai, ka whakaohokia te wai, ka puritia mō tētahi wā kua whakaritea kia ōrite te hanganga. I roto i te whakaputanga ahumahi, ka whai muri i tēnei wāhanga ko te tango tauira hei tātari i te hanganga.
6. Te Maka: Te Maka Mate, te Maka Āhua-ā-papa rānei
Mō ngā wāhanga mīhini ahumahi, ko te tikanga tino noa ko te whakarewatanga mate (pēhanga teitei) nā te mea ka puta he āhua tika, he mata maeneene, ā, he pai mō te hanga papatipu. Heoi, mō te hanga tauine iti, mō ngā wāhanga māmā rānei, ka taea hoki te whakamahi i te whakarewatanga ā-papatipu.
Ngā mea hei aro atu i te wā e ringihia ana:
– Me tika te pāmahana o te wai kia pai ai te rere, kia kore ai e puta he kati makariri (he hapa tēnei nā te tere rawa o te tio o te rere).
– Me ma te pokepokea ai, ā, i roto i te whakarewanga mate, me whakamahi te hinu whakahinuhinu mate ina hiahiatia.
– Ko te hoahoa o te kuaha me te hauhautanga e whakatau ana i te nui o te pūngao me te mau o te hau.
Mō ngā wāhanga miihini, ka taea e te pūngao ā-roto te whakaiti i te kaha me te turuturu ina mahi te wāhanga hei whare hiri.
7. Te Whakamatao me te Maimoatanga Muri i te Maka
I muri i te whakarewanga, ka whakamataohia ngā wāhanga, ā, ka oti te tukanga whakaoti:
– Te kutikuti hei tango i te kaikawe, te kuaha me te uira
– Te mīhini (mēnā e hiahiatia ana) ki ngā tūponotanga tika
– Te tango i ngā pakaru me te whakangawari i ngā taha
– He paninga whiriwhiri, hei tauira, hei whakapai ake i te ātete ki te waikura, hei whakapai ake rānei i te āhua. He maha ngā wā ka pania ngā koranu konutea ki te hiko, i runga i ngā hiahia.
Ko ētahi tono e hiahia ana kia pumau te āhua mō te wā roa. Nō reira, he mea nui te whakahaere i te hanganga me te tukanga whakamatao.
8. Mana Kounga: Te Hanganga, te Hanganga, me ngā Āhuatanga Mīhini
Hei whakarite kia pai ngā koranu konutea mō ngā mīhini ahumahi, me whakahaere tonu te kounga:
1. Whakamātautau hanganga matū
Te whakamahi i te ine āwhata/OES, i tētahi atu tikanga tātari rānei hei whakarite kia tutuki i te hanganga ngā whakaritenga.
2. Tirotiro hapa whakarewa
Tirotiro tirohanga, whakaahua X-ray mō te pūngao o roto, whakaahua rānei i te tae hei wero i ngā kapiti o te mata.
3. Whakamātautau mīhini
Whakamātautau mārō, whakamātautau kume, me te whakamātautau ātete kakahu e ai ki ngā whakaritenga o te wāhanga.
4. Te ine i ngā āhuatanga
Te whakamahi i te CMM, i te taputapu ine tika rānei, hei whakarite kia tutuki ngā whakaritenga—he mea nui tēnei mō ngā wāhanga mīhini.
9. Te Haumaru Mahi me te Taiao
He morearea tonu te konutea wai, ā, me whakahaere mā roto i ngā tikanga OHS:
– Whakamahia ngā PPE katoa (he ārai wera, he karapu, he pare kanohi).
– Me whakarite kia maroke rawa te rauemi; ka pā pea he pīrere kino ki te pā ki te wai.
– Me pai te hauhautanga nā te mea ka puta he paoa/ngā matūriki i te tukanga whakarewa.
– Me whakahaere ngā para para me ngā toenga wai kia rite ki ngā ture taiao.
10. Whakamutunga
Ko te hanga koranu konutea mō ngā mīhini ahumahi ehara i te mea ko te whakaranu noa i te konutea me ētahi atu huānga, engari ko te whakatutuki i te hanganga tika, he tukanga rewa pumau, he ringihanga whakahaere, me te whakahaere kounga whaimana. Mā te whiriwhiri i te koranu tika (hei tauira, ZAMAK 3, ZAMAK 5 rānei), te whakamahi i ngā rauemi mata kounga, me te whakamahi i te tukanga whakarewa tika, ka taea e ngā koranu konutea te whakaputa i ngā wāhanga mīhini ahumahi tika, kaha, me te whai hua.
Ki te hiahia koe, ka taea e au te āwhina i a koe ki te waihanga i tētahi putanga hangarau ake o tēnei tuhinga me ngā tauira o ngā hanganga whāinga (hei tauira, ZAMAK 3 vs. ZAMAK 5), ngā rerenga tukanga mō te whakarewatanga mate, me tētahi rārangi o ngā tawhā QC e whakamahia whānuitia ana i roto i ngā wheketere.
